rewrite lookup_method(), lookup_method_inner(), and lookup_method_inner_()

Author: nikomatsakis

src/libcore/option.rs

@@ -100,6 +100,15 @@ impl extensions<T:copy> for option<T> {
         { map_default(self, def, f) }
     #[doc = "Performs an operation on the contained value or does nothing"]
     fn iter(f: fn(T)) { iter(self, f) }
+
+    #[doc = "Performs an operation on the contained value or does nothing"]
+    fn each(f: fn(T) -> bool) {
+        alt self {
+          none { /* ok */ }
+          some(e) { f(e); }
+        }
+    }
+
     #[doc = "
     Gets the value out of an option
 

src/rustc/middle/ty.rs

@@ -807,10 +807,11 @@ fn fold_region(cx: ctxt, t0: t, fldop: fn(region, bool) -> region) -> t {
 }
 
 fn substitute_type_params(cx: ctxt, substs: [ty::t], typ: t) -> t {
+    if substs.len() == 0u { ret typ; }
     let tb = get(typ);
+    if !tb.has_params { ret typ; }
     alt tb.struct {
       ty_param(idx, _) { substs[idx] }
-      _ if !tb.has_params { typ }
       s { mk_t(cx, fold_sty(s) {|t| substitute_type_params(cx, substs, t)}) }
     }
 }